Controlling computer's sound volume using slider control in Delphi

Does anyone know how to write the source code to use a slider control in Delphi to adjust the computer's sound volume? And to use a progress bar control as an indicator of the sound volume.
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see thius project:

How To Detect Multimedia Devices and Set their Volume
The purpose of the How-To Project is to teach Delphi developers how it is possible to detect the number and names of auxiliary multimedia devices and, optionally, set their volume using a track bar (or any other similar) component. Full source (and documented) code is included and is very easy to understand.  

Regards Barry

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hello ..did you try it ?
Simonet's seems to be unable to detect the volume for each device, it can only set the volume.
cjong75Author Commented:
Sorry for the late reply because very busy lately with my studies. Yes, the program works very well and thank you very much.

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